Sink



FIG. 1 is a perspective view of a sink.

FIG. 2 is a top plan view of the sink of FIG. 1.

FIG. 3 is a front view of the sink of FIG. 1.

FIG. 4 is a rear view of the sink of FIG. 1.

FIG. 5 is a left side view of the sink of FIG. 1; and,

FIG. 6 is a right side view of the sink of FIG. 1.

CLAIM The ornamental design for a “sink”, as shown and described.